pointConstraint.H

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    Copyright (C) 2019 OpenCFD Ltd.
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License
    This file is part of OpenFOAM.

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Class
    Foam::pointConstraint

Description
    Accumulates point constraints through successive applications of the
    applyConstraint function.

    After all the constraints have been entered the resulting
    transformation tensor is returned by the constraintTransformation
    function.

SourceFiles
    pointConstraintI.H

\*---------------------------------------------------------------------------*/

#ifndef pointConstraint_H
#define pointConstraint_H

#include "label.H"
#include "vector.H"
#include "Tuple2.H"
#include "transform.H"
#include "contiguous.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

namespace Foam
{

/*---------------------------------------------------------------------------*\
                           Class pointConstraint Declaration
\*---------------------------------------------------------------------------*/

class pointConstraint
:
    public Tuple2<label, vector>
{

public:

    // Constructors

        //- Construct null
        inline pointConstraint();

        //- Construct from components
        inline pointConstraint(const Tuple2<label, vector>&);

        //- Construct from Istream
        inline pointConstraint(Istream&);


    // Member Functions

        //- Apply and accumulate the effect of the given constraint direction
        inline void applyConstraint(const vector& cd);

        //- Combine constraints
        inline void combine(const pointConstraint&);

        //- Return the accumulated constraint transformation tensor
        inline tensor constraintTransformation() const;

        //- Return the accumulated unconstrained directions. Directions
        //  coded as first n rows of tensor.
        inline void unconstrainedDirections(label& n, tensor& vecs) const;

        //- Constrain a displacement
        inline vector constrainDisplacement(const vector& disp) const;
};


// * * * * * * * * * * * * * * * * * Traits  * * * * * * * * * * * * * * * * //

//- Contiguous data for pointConstraint
template<> struct is_contiguous<pointConstraint> : std::true_type {};


//- Reduce operator
class combineConstraintsEqOp
{
public:
    inline void operator()(pointConstraint&, const pointConstraint&) const;
};


// * * * * * * * * * * * * * * * Global Functions  * * * * * * * * * * * * * //

//- Transformation function
inline pointConstraint transform(const tensor& tt, const pointConstraint& v);


// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

} // End namespace Foam

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#include "pointConstraintI.H"

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

#endif

// ************************************************************************* //